The OBD code P0174 for Nissan indicates a System Too Lean (Bank 2) condition.
This code affects the fuel system, specifically Bank 2 of the engine.
Symptoms include the Check Engine light on, increased fuel consumption, and potential engine misfires.
Common causes are intake air leaks, faulty oxygen sensor, ignition issues, or a malfunctioning MAF sensor.
While not an immediate threat, it can lead to poor engine performance.
A possible fix involves inspecting and repairing any intake leaks, checking sensor functionality, and ensuring proper fuel system operation.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 10.0 (Out of 10) |
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Symptoms of the Nissan p0174 OBD Code
The vehicle may exhibit a lean condition on bank 2 of the engine.
- Symptoms: Engine Light ON (or Service Engine Soon Warning Light).
- Excessive Fuel Consumption.
- Rough idle.
- Lack of power during acceleration.
- Hissing or sucking noise from the engine.
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Causes of the Nissan p0174 OBD Code
Possible reasons for Nissan P0174 include vacuum leaks, faulty MAF sensor, or fuel delivery issues.
- P0174 can be caused by intake air leaks.
- A faulty front heated oxygen sensor.
- Ignition misfiring.
- Faulty fuel injectors.
- Exhaust gas leaks.
- Incorrect fuel pressure.
- Lack of fuel.
- A faulty Mass Air Flow (MAF) sensor.
- Or an incorrect Positive Crankcase Ventilation (PCV) hose connection.
Fixing Nissan Error Code p0174 Step By Step
Addressing a lean condition on bank 2 by checking for vacuum leaks and inspecting the MAF sensor.
- To fix the Nissan OBDII code P0174, start by reviewing the possible causes related to a lean condition on bank 2.
- Visually inspect the intake system for any vacuum leaks, such as cracked hoses or loose clamps.
- Check the Mass Air Flow (MAF) sensor for dirt or contamination, and clean or replace if necessary.
- Inspect the fuel pressure and volume to ensure proper delivery to the engine.
- Verify the functionality of the oxygen sensors on bank 2 and replace if readings are out of specifications.
- Reset the Engine Control Module (ECM) to clear the code and monitor for its return.
- If the issue persists, consider performing a smoke test to pinpoint any hidden vacuum leaks.
Cost Of Fixing Nissan p0174 Fault Code
The repair for Nissan P0174 may involve diagnosing and fixing issues with the fuel system.
The cost to diagnose and fix a Nissan OBD code P0174 typically ranges from $75 to $150 for labor rates per hour.
With an estimated repair time of 1. 0 hour, the total cost can be around $75 to $150, depending on shop rates and the complexity of the issue.
Details of the Nissan p0174 OBD Code
Nissan P0174 indicates a lean condition in bank 2 of the engine.
Code P0174 for Nissan vehicles indicates a system too lean condition in bank 2. This means that the engine control module (ECM) has detected that the airfuel mixture is too lean on the side of the engine that contains the second cylinder bank.
The ECM triggers this code based on the feedback from the oxygen sensors, which monitor the oxygen levels in the exhaust gases.
Mechanic’s Tech Notes
Detailed information on diagnosing and fixing Nissan code P0174 related to a lean condition in bank 2.
To diagnose and fix OBDII code P0174 on a Nissan, start by checking for vacuum leaks in the intake system.
Use a smoke machine or propane torch carefully around intake gaskets, hoses, and vacuum lines.
Inspect the MAF sensor for dirt or debris that could affect its readings.
Test the fuel pressure to ensure it meets specifications.
Check for exhaust leaks near the upstream oxygen sensor.
Use a scan tool to monitor fuel trims and oxygen sensor data for any irregularities.
If no issues are found, consider cleaning or replacing the MAF sensor.
FAQ
Common causes of OBD code P0174 in a Nissan: intake air leaks, faulty front heated oxygen sensor, ignition misfiring, faulty fuel injectors, exhaust gas leaks.
Diagnose P0174 in Nissan: Check for intake leaks, faulty O2 sensor, misfires, fuel injector issues, exhaust leaks, fuel pressure, MAF sensor, PCV hose. Inspect wiring/connectors for damage.
It is not safe to continue driving with a P0174 fault code in your Nissan. Check for intake air leaks, faulty sensors, misfires, or fuel system issues.
Wrap Up
If your Nissan triggers OBD code P0174 and you notice poor fuel economy, rough idle, or lack of power, it may be caused by a vacuum leak, faulty oxygen sensor, or a clogged fuel filter.
These issues can lead to a lean fuel mixture on bank 2 of the engine, triggering the P0174 code.
To address Nissan OBD code P0174, check for vacuum leaks in the intake system, inspect the oxygen sensor on bank 2, and replace the fuel filter if necessary.
Ensure proper fuel pressure and clean air intake components to prevent a lean condition.
